安卓判断APP是在前台还是在后台

朴灿烈づ我的快乐病毒、 2024-02-18 22:55 52阅读 0赞

安卓中判断APP是否在前台：

方法一：CCApplication 中判断

private boolean mIsInForeground = false;

public boolean isInForeground() {
        return mIsInForeground;
    }

private class CCActivityLifecycleCallbacks implements ActivityLifecycleCallbacks {
    
        @Override
        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
        }
    
        @Override
        public void onActivityStarted(Activity activity) {
            MonkeyLog.d(TAG, "onActivityStarted :" + activity);
        }
    
        @Override
        public void onActivityResumed(Activity activity) {
            mIsInForeground = true;//APP在前端
            Adjust.onResume();
            setCurrentActivity(activity);
        }
    
        @Override
        public void onActivityPaused(Activity activity) {
            mIsInForeground = false;//APP 在后台
            Adjust.onPause();
            setCurrentActivity(null);
        }
    
        @Override
        public void onActivityStopped(Activity activity) {
    
        }
    
        @Override
        public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
    
        }
    
        @Override
        public void onActivityDestroyed(Activity activity) {
    
        }
    }

在APPlication的onCreate()方法中：

registerActivityLifecycleCallbacks(new CCActivityLifecycleCallbacks());

使用的时候直接判断：

if (!CCApplication.getInstance().isInForeground()) {
       //ToDo
    }

方法二：

在BaseActivity中

// 当前app是否是前台状态
    private static boolean isActive = false;

在BaseActivity 的onResume()方法中：

@Override
    protected void onResume() {
        super.onResume();
        if (!isActive) {
            //app 从后台唤醒，进入前台
            isActive = true;
        }
    }

在onStop()方法中：

@Override
    protected void onStop() {
        super.onStop();
        if (!isAppOnForeground()) {
            //app 进入后台
            isActive = false；
        }
    }

/**
     * 程序是否在前台运行
     *
     * @return
     */
    private boolean isAppOnForeground() {
        // Returns a list of application processes that are running on the device
    
        ActivityManager activityManager = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
        String packageName = getApplicationContext().getPackageName();
    
        List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager
                .getRunningAppProcesses();
        if (appProcesses == null)
            return false;
    
        for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
            // The name of the process that this object is associated with.
            if (appProcess.processName.equals(packageName)
                    && appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                return true;
            }
        }
    
        return false;
    }

这样就可以判断APP是在前台还是在后台了

常用的地方是当接收到Notification消息时，当APP在前端直接处理消息 当APP在后台时 将Notification消息显示在手机的消息栏中

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